How much Roxul to use

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Archer39

Feeling the Heat
Hearth Supporter
Sep 23, 2009
288
Pottstown PA
I am installing my insert and was wondering how much Roxul to put above my block off plate? I have two layers above it now is this enough? There is plenty of room in the damper area due to the large 13x18 flue.
 
Two 6" layers is enough.
 
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